Selvage-trimmer



F. J. MACDONALD.

SELVAGE TRIMMER.

APPLICATION FILED JULY |6| 1918- v 1,367,068. Patented Feb. 1, 1921.

@QkfC/g UNITED STATES PATENT OFFICE.

FRANK J. moDONALD, OI KB-OH, OHIO, ABSIGNOB '10 m I'IRESTONE m AID RUBBER COMPANY, OF AKRON, 0310, A. CORPORATION OF OHIO. V

smavaen- Specification of Letters Patent.

Patented Feb. 1, 1921.

Application fled July 16, 1918. Serial No. 845,255.

To all whom it may concern:

Be it known that I, FRANK J. MACDON- ALD, a citizen of the United States, residlng in the city of Akron, county of Summit, and State of Ohio, have invented certain new and useful Improvements in Selvage- Trimmers, of which the following is a specification.

In the manufacture of automobile tire casings, which are constructed of layers of rubberized fabric as a base, it is essential that the selvage edge be removed from the fabric in order that no ob'ectionable rid s may appear on the finis ed tire. Vamous' at-'. tempts have been made to construct ma chines for this purpose, which have been more or less successful, but the machines for this purpose have been large and cumbersome and have not gone into extensive use. I have designed a machine to trim selvage which is simple and will successfully remove the selvage from the edge of the fabric.

The trimmer may be put in operatlon at any point in the treatment of the fabric. The selvage may be trimmed either during the calendering operation or during the bias. cutting of the fabric, but it is preferred that the operation take place in the preparation of the fabric between the application of the friction coats and the application of the skim coat. For this purpose my machine is designed to be mounted on one of the calenders which rubberize the fabric, although it is not limited to use in such location.

It is well known that the edge of the fabric will vary in position durin its travel through the calenders to a consi erable ex tent, this variation being due some times to differences in the-width of the cloth, and quite often to irregular rolling or rerollmg which is given the cloth in its preliminary treatment before being rubberized. The a paratus designed by me is intended to eas1 y follow these variations in the travel of the cloth edge and to move the knife so that it will always trim the strip of selvage of equal width from the cloth edge.

In the drawings accompanying this application, I have Shown one embodiment of my invention, but it is understood that the construction and 0 eration are susceptible of changes within t e scope of the invention.

. Figure 1 is a front elevation of the 'selvage trimmer showing the knife in the act of trimming thenarrow selvage edge.

Fig. 2 is a side elevation.

Fig. is a view looking down on the selva trimmendand1 1g. is a etai of the in car i the rolls for moving the selvagstrimm lit? follow the sinuoslties or variations in travel of the edge of the cloth. The a paratus. is designed to be mounted on a ra1 or angle iron 1, which is adapted to be secured to a calender or other structure close to and paralleling the fabric in its travel. The upper part of the rail is formed as a'trackwa' 2, on which are adapted to travel groove rolls 3 which carry a T-shaped frame on supporting member 4. It 1s understood that the apparatus shown 1s designed to trim one edge of the fabric and 1s duplicated for the opposite side, a shovging and description of one being suflic1en On the lower. part of the T-shaped frame there is mounted a horizontal roller 5, which but it is'preferred that it be a square or other polygonal shape so that it will cut into the fabric during rotation more readily than a clrcular knife. Midway of the vertical arms of the support 4 is rotatably mounted a grooved roller 8, the groove of. which is opposite the knife 7 and cooperates with it severing the fabrlc 9.

In order to move the supporting frame with its motor and knife mechanismto and fro to correspond to the movement of the fabric edge, use is made of a pair of guiding or actuating rollers indicated at 10 and 11,

which are run over the edge of the fabric and are set atan obtuse an le to the fabric moving in the direction of t e arrow so that there will be a" constant dra imparted by the rollers tending to crow the frame 4 against the ed e of the fabric, which movement is resiste by a small roller 12 mounted to contact the fabric edge and at a slight distance outward from the line of travel of the knife, the distance being determined for the width of the selvage to be trimmed. The roller 12, therefore, constitutes a stop to limit the inward movement of the knife and .the carrier. One of the rollers, preferably the roller 11 which is behind the fabric is carried on an angular arm 13 inte al with a pin 14 screwed into the supportmg arm.

The other roller 10 is carried on a second angular arm 15 slidably mounted on the pin duced end 18 o the pin. The roller 12 heretofore mentioned is 'rotatably mounted on the pin between the arms 13 and 15.

The arms 13 and 15 are right angled, as shown in Fig. 2 and may be moved around the pin 14 in any position to modi the degree of an larity of the rolls 10 and 11 with the fa ric as ma be found necessary in operation, the angul arity of the rolls being adjusted so that there w1ll be sufficient pull on the frame to keep the roller 12 in contact with the edge of the fabrlc at all times, and the tension of the spr1ng 16 1s adjusted so that rollers 10 and 11 Wlll be maintained under enough pressure to hold the roller 12 against the edge of the fabric. The two roller carrying arms are prevented from turning relatlve to one another by a pin 19 secured on one arm and enterlng the other arm.

It is believed that the operation of the machine will be readily understood. The

fabric moving in the direction of the arrow, Fig. 1, causes the rollers 10 to revolve in such manner that they exert a constant tendency to move inwardly toward the center line of the .fabric and draw the T-shaped frame 4 carrying the knife with them. The movement inwardly, to a certain extent, is resisted by the roller 12 which bears against the edge of the fabric. By this means the traveling knife carrier is kept in a constant position relative to the meandering fabric edge, and the depth of the cut taken by the knife 7 will be constant.

Although the apparatus has been described in detail, these details are not essential and may be varied as desired without departing from the spirit of the invention or without altering the scope thereof as set forth in the appended claims.

I claim:

1. In an apparatus for removing the selvage from a fabric, the combinatiomof a movable knife carrier, means adapted to contact the edge of the fabric, and a member contactin the surface of the fabric, through whic the knife carrier is adapted to be moved to keep the ed e contacting means against the edge of the abric.

2. In an apparatus for removing the selvage from a fabric, the combination of a movable knife carrier, a roller on said carrier adapted 'to contact the edge-of the fabric, and a member contacting the surface of the fabric, connections from said member to the carrier, the member operating to move the carrier to keep the roller in contact with p the edge of-the fabric.

3. In an apparatus for removing the eelvage from a fabric, the combination of a movable knife carrler, an. ed e contacting element on said carrier, a rolfiar contacting the surface of the fabric and set at an angle to the line of movement of the fabric, connections between the roller and the knife carrier to movethe latter so as to keep the edge contacting element against the edge of the fabric.

4. In an apparatus for-removing the eelvage from a fabric, the combination of a movable knife carrier, an edge contacting roller on said carrier, a roller adapted to run on the surface of the fabric and so mounted that the movement of the fabric will cause it to have a tendency to move inward on the fabric and connection from the surface contacting roller to the carrier.

5. In an apparatus for removing the selvage from a fabric, the combination of a knife carrier movable transversely of the fabric, an edge contacting member connected to the carrier, a roller adapted to run over the surface of the fabric and so mounted that the movement of the fabric will cause it to have a tendency to move inwardly on the fabric, and connections from the surface contacting roller to the carrier whereby the edge contacting -member is maintained against the fabric edge.

6. In an apparatus for removing the selvage from a fabric, the combination of a trackway, a carrier movable on said trackway transversely of the fabric, a knife in said carrier, an edge contacting roller on said carrier, anarm on said carrier, a roller supported on the arm in such position that its axis is at an obtuse angle to the line of travel of the fabric.

7. In an apparatus for removing the selvage from a fabric, the combination of a trackway, a carrier movable on said trackway transversely of the fabric, an edge contacting memberon said carrier, a knife on said'carrier, a roller, the axis of the roller being at an angle to the line of travel of the fabric, means for causing the roller to bear on the surface of the fabric, and connecting means from the roller to the carrier whereby the carrier is moved to maintain the edge contacting member against the fabric edge.

8. In an apparatus of the character set forth.'a.knife and its carrier movable transversely of the fabric, an edge contacting member limiting the movement of the carrier toward the" fabric, a roller contacting the surface of the fabric and movable toward the center of the fabric by its rolling action thereon, andconnections between the roller and the carrier whereby the edge contacting member is maintained against the edge of the fabric.

9. In an apparatus of the character set forth, a knife and its carrier, movable toward and away from the fabric, an edge contacting member limiting the movement of the carrier toward the fabric, a roller contacting the surface of the fabric and so constructed as to move transversely of the fabric, and connection between the roller and the carrier whereby the movement of the roller is transmitted to the carrier to draw it in toward the center of the fabric.

10. In an apparatus for trimming selvage from a moving strip of fabric, a guideway transverse to the fabric, a knife movably mounted on said guideway and a stop to limit the inward movement of the knife, in combination with means for moving the knife inwardly comprising a pair of rollers between which the fabric runs, the axes of said rollers being at an obtuse angle to the line of travel of the fabric and connections from the rollers to the knife.

11. In an apparatus for trimming selvage from a moving strip of fabric, a guideway transverse to the fabric, a knife carrier mounted on said guideway, a knife on said carrier, a roller on the carrier adapted to contact the edge of the fabric, a pair of arms on said carrier, rollers on said arms arranged at an obtuse angle to the line of travel of the fabric, said rollers being so arranged as to be located on either side of the fabric, and means to yieldingly hold said rollers together.

12. In an apparatus for trimming selvage from a moving strip of fabric, a movable knife, a device for moving the knife toward the center of the fabric, and a stop to limit the inward movement of the knife, the said device being arranged to be operated by the longitudinal movement of the surface of the fabric.

18. In a devicefor trimming fabric, the combination of a knife carrier, means for moving the carrier to follow the sinuosities of the fabric edge, and aknife on the carrier, said knife being polygonal in shape.

14. In a device for trimming fabric, the combination of a knife carrier, means for moving the carrier to follow the sinuosities of the fabric edge, and a knife on the carrier, said knife being polygonal in shape, and a roller on said carrier cooperating with the knife.

FRANK J. MAoDONALD. 

